Data-backed planning intelligence · 2,500,000+ decisions analysed across England

Most Common Planning Applications in Monmouthshire

Not all planning applications are created equal. The gap between the highest and lowest approval project type in Monmouthshire is 5.7% — that's the difference between near-certainty and a coin flip. What you build matters as much as where you build it.

1,350 real decisions·8 project types·Updated March 2026
100.0%
Safest: Side Extension
94.3%
Lowest: Outbuilding
5.7%
Spread
8
Types ranked

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All 8 project types ranked

#TypeDecisionsApprovedRefusedRate
1Side Extension31310
100.0%
2Dormer33330
100.0%
3Rear Extension59590
100.0%
4Change of Use (Residential)20200
100.0%
5Conservatory22220
100.0%
6Garage / Parking1261242
98.4%
7Extension (General)1191172
98.3%
8Outbuilding53503
94.3%
See how this applies to your postcode →

These are council averages. Your property is specific.

A side extension application has a 100.0% approval rate. Outbuilding? Just 94.3%.
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What the data tells us

1
The range is massive: 94.3% to 100.0%. Choosing the right project type — or framing your application correctly — can dramatically affect outcomes.
2
Visibility drives scrutiny. Project types that change the external appearance — dormers, loft conversions, hip-to-gable — face more resistance than those that don't. The more visible your proposal, the more carefully it needs designing.
3
These are council-wide averages. Your ward, your street and your immediate neighbours all shift the odds. The comparable decisions near your property are the best indicator of outcome.

Before you spend £5,000+ on architects and drawings

21 planning applications in Monmouthshire have been refused since 2020. Many of those homeowners had already paid for drawings and application fees. A £79 report shows you what gets approved — and what gets refused — near your property.

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More Monmouthshire planning data

Nearby councils project type rankings

Methodology: Classifies 1,350 decisions in Monmouthshire into residential project types using keyword matching against proposal descriptions (matching generate_site_data.py subtype rules). A single application may appear in multiple categories. Data from Monmouthshire Council's public planning portal, January 2020 to present. Full methodology →
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